32 Catalogue of Works on Gardenings S^c. 



4 or 5 feet deep ; it should remain in that state about a week, and 

 then as much mould added as will cover the pots when they 

 are sunk in it. The pots should be now all put in, and the 

 sash raised 4 or 5 inches, to admit air both night and day, so that 

 the steam generated by the heat may readily escape. This 

 must not be neglected even during frosty weather ; otherwise 

 the hyacinths will be burnt. 



During a severe frost it may be thought that admitting the 

 air is quite unnecessary, but it must not be omitted, only hang- 

 ino- cloths over the opening ; as if air be not admitted, all the 

 hyacinths will be found burnt up the following morning. 



REVIEWS. 



Art. I. Catalogue of Works on Gardening, Agriculture, Botany, 

 Rural Architecture, 8^c., lately published, with some Account of 

 those considered the more interesting. 



The Elements of Botany for Families and Schools. Published under the 

 direction of the Committee of General Literature and Education, appointed 

 by the Society for promoting Christian Knowledge, 4th edition, small 8vo, 

 pp. 139, numerous woodcuts. London, 1839. 



One of the best little books of the kind which we have seen, embracing 

 structure, physiology, and classification. At the end there is a useful Hst of 

 plants, in four columns, the first containing the English or popular names of 

 all the plants, the products of which, or any part of which, are in use in 

 the arts, or in general economy ; the second, their scientific name ; the 

 third, the name of the natural order to which they belong ; and the fourth, 

 their Linnaean class and order. Besides the woodcuts, representing leaves, 

 buds, roots, &c., there are pictorial representations of Dicotyledonous and 

 Monocotyledonous plants. 



Cactearum Genera nova Speciesque novce, et omnium in Horto Monvilliano cul- 



tarum ex Affinitatibus naturalihus Ordinatio nova Indexque Methodicus. Auc- 



tore C. Lemaire. Svo, pp. 115. Paris, 1839. 



This is an attempt at a new arrangement of the Cacteae, in which the genera 

 are disposed in linear series, by their affinities, and separated into two tribes 

 by their mode of germination. The author developes his plan as follows. 



" The Cacteae separate themselves, at first sight, into two divisions ; one con- 

 sisting of plants with elongate stems, leafy or leafless, jointed or continuous ; 

 the other of plants with stems low or nearly wanting, globose, simple or 

 branched : thus, by easy and convenient comparison, they are linearly arranged 

 in the most natural manner." After long and anxious pondering on the best 

 way of separating the series into these divisions by a botanical character at 

 once simple and precise, "the mode of germination flashed across his mind, and 

 his heart leaped for joy." The author proceeds : " Having discovered this 

 guide, I formed all the caulescent Cacteae with true foliaceous cotjledons into 

 my first tribe, which I named Phyllariocotyledoneae ; and the globose or stem- 

 less with true tuberculate cotyledons into my second, which I named Phyma- 

 tocotyledoneae. From this character flows the following physiological law : 

 'Amongst the Cacteae, the form of the cotyledons indicates the habit, and con- 

 sequently the mode of vegetation, of the future plant, and affords the best 

 character for separating them into two natural tribes.' 



" The germination of Cacteae may be divided into three periods common to 



